Oasyleum: A Million-Person Desert City Built on Pentagonal Geometry

What would it take to build a city for one million people in a landscape that receives less than 50mm of rainfall per year? Oasyleum answers that question not with brute-force engineering but with a rigorous return to vernacular principles: arched roofs, wind catchers, domes, underground water storage, and local materials like mud brick, limestone, and palm wood. The result is a proposal that treats the Saharan desert not as an obstacle to overcome but as a design parameter to work within.

Designed by Mateusz Mulica and Błażej Wendrowski, Oasyleum was shortlisted in the Extreme Habitat Challenge (EHC) – Sahara edition. Sited in Mauritania's desert interior, the project reimagines the concept of an oasis as a high-density, self-sufficient urban settlement, merging Islamic-Arabic spatial traditions with a scalable modular masterplan that anticipates future Hyperloop connectivity to global hubs like New York and Mumbai.

Radial Symmetry and Pentagonal Logic

The masterplan's organizing principle is a repeating pentagonal module, visible in the plan drawing as a field of polygonal cells converging on a central square via diagonal pathways. The geometry is not arbitrary. Floral and polygonal patterning, drawn from Islamic decorative traditions, produces a layout where each module contains its own live, work, and play zones centered around a mosque and community hub. The axonometric rendering makes the spatial hierarchy legible: residential blocks cluster tightly near the center, green spaces ring the perimeter, and a central dome anchors communal life.

Building density decreases as you move outward from each module's core, transitioning from multi-story mixed-use structures to single-family housing and open landscape. This gradient allows the city to scale organically. New pentagonal sectors can be added without disrupting the coherence of existing ones, giving Oasyleum a cellular growth logic that mirrors biological systems.

Color-Coded Zoning for a Mixed-Use Desert District

The presentation board lays out the habitat plan alongside color-coded zoning diagrams that separate residential, commercial, and recreational functions within each pentagonal module. What stands out is the deliberate interweaving of these zones rather than their strict separation. Live, work, and play areas overlap at edges and share circulation routes, producing a walkable urban grain where daily life does not require long commutes through hostile open terrain. In an environment where extreme temperature swings punish unnecessary exposure, this compactness is not just convenient; it is a survival strategy.

Courtyards, Perimeter Green, and Passive Cooling

The aerial perspectives reveal the texture of Oasyleum at the neighborhood scale. Residential blocks are organized around courtyards, a direct inheritance from vernacular Islamic-Arabic architecture where enclosed outdoor space provides shade, channels airflow, and creates microclimates. Perimeter green spaces serve as thermal buffers, reducing heat gain at the settlement's edges. At the center, a domed structure presides over a plaza from which radiating pathways extend outward, creating clear sightlines and wayfinding cues.

The passive cooling toolkit goes beyond courtyard planning. Arched roofs and domes minimize surface area exposed to direct solar radiation. Wind catchers draw cooler air into interior spaces. Underground water storage maintains reserves against the near-total absence of rainfall. All of this is executed with a low-carbon construction philosophy: mud brick, limestone, and palm wood sourced locally. The environmental approach is not speculative; it is tested over centuries and adapted here to urban scale.

Residential Typologies That Track Socio-Economic Diversity

The diagram sheet catalogues the range of residential typologies, from simple rectangular blocks to more complex integrated forms. Elevations, unit plans, and a sequence showing the evolution of building forms illustrate how the architecture adapts to varying income levels without abandoning a shared formal language. Simpler units use straightforward massing and minimal interior subdivision, while wealthier configurations introduce courtyard layering and more elaborate spatial sequences. The key insight is that socio-economic diversity does not require visual fragmentation; collective identity and individual variation coexist within the same pentagonal framework.

Why This Project Matters

Oasyleum resists the temptation common in extreme-environment design competitions to rely on futuristic technology as a silver bullet. Instead, Mulica and Wendrowski ground their proposal in materials and strategies that have sustained desert communities for centuries, then scale those principles up to a city of one million. The pentagonal module, the courtyard block, the wind catcher: none of these are novel in isolation, but their systematic integration into a coherent masterplan is where the project's ambition lies.

As arid regions expand and climate pressures intensify, proposals like Oasyleum gain urgency beyond the competition circuit. The project demonstrates that resilient desert urbanism does not require abandoning tradition or importing alien building systems. It requires reading the environment closely and organizing density, material, and geometry to work with the harshest conditions on Earth rather than against them. That is a blueprint worth studying.

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About the Designers

Designers: Mateusz Mulica, Błażej Wendrowski

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Project credits: Oasyleum by Mateusz Mulica, Błażej Wendrowski (EHC) – Sahara (uni.xyz).